Piemontite

Epidote supergroup, sorosilicate mineral

Piemontite is a sorosilicate mineral in the monoclinic crystal system with the chemical formula Ca2(Al,Mn3+,Fe3+)3(SiO4)(Si2O7)O(OH). It is a member of the epidote group. Red to reddish-brown or red-black in color, piemontite has a red streak and a vitreous lustre.

Nº Q425187 ★

Common · Knowledge

Piemontite

Epidote supergroup, sorosilicate mineral

Piemontite is a sorosilicate mineral in the monoclinic crystal system with the chemical formula Ca2(Al,Mn3+,Fe3+)3(SiO4)(Si2O7)O(OH). It is a member of the epidote group. Red to reddish-brown or red-black in color, piemontite has a red streak and a vitreous lustre.

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From Wikipedia

Piemontite is a sorosilicate mineral in the monoclinic crystal system with the chemical formula Ca2(Al,Mn3+,Fe3+)3(SiO4)(Si2O7)O(OH). It is a member of the epidote group. Red to reddish-brown or red-black in color, piemontite has a red streak and a vitreous lustre. Manganese (Mn3+) causes the red color. The type locality is the Prabornaz Mine, in Saint-Marcel, Aosta Valley, Italy. It occurs metamorphic rocks of the greenschist to amphibolite metamorphic facies and in low-temperature hydrothermal veins in altered volcanic rocks. It also occurs in metasomatized deposits of manganese ore. Associated minerals include: epidote, tremolite, glaucophane, orthoclase, quartz and calcite.

Text: Wikipédia, CC BY-SA 4.0. · Image: Aangelo (CC BY-SA 3.0) ·

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